<template>
  <el-breadcrumb class="app-breadcrumb" separator-class="el-icon-arrow-right">
    <transition-group name="breadcrumb">
      <el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path" :to="{ path: item.path }">
        <span v-if="item.redirect==='noredirect'||index==levelList.length-1" class="no-redirect">{{ item.meta.title }}</span>
        <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script>
import pathToRegexp from 'path-to-regexp'

export default {
  data () {
    return {
      levelList: null
    }
  },
  props: ['currentPath'],
  watch: {
    $route () {
      this.getBreadcrumb()
    }
  },
  created () {
    this.getBreadcrumb()
  },
  methods: {
    getBreadcrumb () {
      let matched = this.$route.matched.filter(item => item.name)

      const first = matched[0]
      console.log('tag', first)
      if (first && first.name !== 'dashboard') {
        console.log('tag1', first.name)
        matched = [{path: '/dashboard', meta: { title: '首页' }}].concat(matched)
      }
      console.log('tag2', matched)
      this.levelList = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
      console.log('tag3', this.levelList)
    },
    pathCompile (path) {
      const { params } = this.$route
      var toPath = pathToRegexp.compile(path)
      return toPath(params)
    },
    handleLink (item) {
      console.log(item)
      const { redirect, path } = item
      if (redirect) {
        this.$router.push(redirect)
        return
      }
      this.$router.push(path)
    }
  }
}
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
  .app-breadcrumb.el-breadcrumb {
    width: 100%;
    height: 40px;
    line-height: 40px;
    padding-left: 20px;
    margin-left: 0px;
    font-size: 14px;
    background: #f5f5f5;
    .no-redirect {
      color: #97a8be;
      cursor: text;
    }
  }
</style>
